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Updated: Aug 26, 2026

A Finite Element Approach for Locating the Center of Resistance of Maxillary Teeth
Published on: April 8, 2020
[Analysis the stress variations of the root canal wall of pulpless tooth by different root canal preparation with
Jin Hong1, Wen-wei Xia, Ya-qin Zhu
1Department of Oral Medicine, Ninth People's Hospital, Shanghai Second Medical University, Shanghai 200011, China. hj1221@online.sh.cn
Objective:
To analyze the stress variations of the root canal wall of pulpless tooth by different root canal preparations.
Methods:
On the basis of the set up model of the mandibular first molar, modified model was established by simulation of the routine or step-back root canal preparation and filling in. Then the maximum mises stress of each part of teeth and wall of root canal were calculated by special finite-element software.
Results:
The stress-changing tendency is similar between two modified models but the maximum mises stress of the model by step-back technique is a little greater than one by routine. The stress of wall of mesial-buccal root canal was the greatest and one of mesial-lingual root canal was the least at three root canals. The stress-changing tendency of modified models was similar to original model. The maximum mises stress of modified models was near or less than one of original model except that of amalgam layer because of material property alteration.
Conclusion:
Not only routine but step-back technique is an effective and safe method. Dentist can choose them in practice.
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